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2x^2-x-15
a=2,b=-1,c=-15
sum = alpha+beta=-b/a=-(-1)/2=1/2
product=alpha*beta=c/a=-15/2
2x^2-6x+5x-15
2x(x-3)+5(x-3)
(2x+5) (x-3)
x=-5/2 x=3
alpha=-5/2,beta=3
s=-5/2+3=-5+6/2=1/2
p=-5/2(3)=-15/2
hence proved
a=2,b=-1,c=-15
sum = alpha+beta=-b/a=-(-1)/2=1/2
product=alpha*beta=c/a=-15/2
2x^2-6x+5x-15
2x(x-3)+5(x-3)
(2x+5) (x-3)
x=-5/2 x=3
alpha=-5/2,beta=3
s=-5/2+3=-5+6/2=1/2
p=-5/2(3)=-15/2
hence proved
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